20111222112 has 24 divisors (see below), whose sum is σ = 52791958296.
Its totient is φ = 6703740672.
The previous prime is 20111222107. The next prime is 20111222119. The reversal of 20111222112 is 21122211102.
Adding to 20111222112 its reverse (21122211102), we get a palindrome (41233433214).
It is a tau number, because it is divible by the number of its divisors (24).
It is a super-2 number, since 2×201112221122 (a number of 21 digits) contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 20111222091 and 20111222100.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20111222119) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104745853 + ... + 104746044.
It is an arithmetic number, because the mean of its divisors is an integer number (2199664929).
Almost surely, 220111222112 is an apocalyptic number.
It is an amenable number.
20111222112 is an abundant number, since it is smaller than the sum of its proper divisors (32680736184).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20111222112 is a wasteful number, since it uses less digits than its factorization.
20111222112 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 209491910 (or 209491902 counting only the distinct ones).
The product of its (nonzero) digits is 32, while the sum is 15.
The spelling of 20111222112 in words is "twenty billion, one hundred eleven million, two hundred twenty-two thousand, one hundred twelve".